Healthcare providers typically prescribe finasteride (Propecia® and Proscar®) for the treatment of male pattern baldness or an enlarged prostate (commonly referred to as benign prostatic hyperplasia or BPH). It works by preventing the body from converting testosterone into dihydrotestosterone. The medication comes in tablet form and is generally taken once a day.
When taking finasteride for either of the conditions mentioned here, it is important to understand that it can take anywhere from three to six months to see results, so don't become impatient if you don't see results right away. If you are experiencing bothersome or serious side effects, however, talk to your healthcare provider about an alternative medication.
(To learn more about this drug, click Finasteride. This full-length article goes into more detail about how this medication works, how it performed in clinical studies, what to discuss with your healthcare provider, and more.)